Reusable Food-Grade Airtight Rubber Silicone Seals for use with the Wide Mouth Ball, Kerr and Mason Jar Plastic Canning Storage Lids, Cotton Millz WIDE MOUTH Silicone Seals 3&rdquo; (10 count) SILICONE SEALS are the best seals for any brand wide mouth plastic caps on the market guaranteed! Seals are BPA-free Food Grade; includes Seals only; lids not included Wide Mouth dimensions are 2 11/16 inches inner diameter and 3 3/8 inches outer diameter